Field device



FIG. 1 is a front elevation view of a field device showing our new design;

FIG. 2 is a rear elevation view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a left side view thereof; and,

FIG. 7 is a right top perspective view thereof.

The broken line portion of the drawings is included to show unclaimed subject matter only and forms no part of the claimed design. 

The ornamental design for a field device, as shown and described. 